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Brassfield Formation
BT
Chronostratigraphic Units
.
Phanerozoic
..
Paleozoic
...
Silurian
....
Lower Silurian
.....
Brassfield Formation
RT
Kentucky
Illinois
Indiana
Ohio
Tennessee
Arkansas
SN
Considered to consist of lower dolomitic limestone, including Whitfieldella bed, and Plum Creek Clay Member above. In central N Arkansas, S Indiana, SW Illinois, central Kentucky, SW Ohio, and S Tennessee.
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